The allocated hours of generators in different enterprises in Guangdong after the reform. The total sample size from 2016 to 2019 is 676, including both coal-fired and gas-fired generators. P values between central SOEs and local SOEs in Guangdong from 2016 to 2019 are 0.082, 0.65, 0.084 and 0.019. A two-sided t test is used for between-group variation comparison. The five lines from top to bottom of each box represent the 75th percentile + 1.5 interquartile range (IQR), 75th percentile, 50th percentile (median), 25th percentile and 25th percentile - 1.5IQR. The outside values (greater than 75th percentile + 1.5IQR or less than 25th percentile - 1.5IQR) are excluded from the figure for clarity.
